Error at usb.util.get_string

[cconde]

Hi, Surely I'm doing something wrong, but when executing ccsniffer.py I get stuck at an error message:

`$: sudo python ccsniffer.py'

I get: 'Traceback (most recent call last): File "ccsniffer.py", line 234, in sniffer = CC2531(callback) File "ccsniffer.py", line 79, in init self.name = usb.util.get_string(self.dev, self.dev.iProduct) TypeError: get_string() takes at least 3 arguments (2 given) `